
\begin{table}
\begin{center}
\begin{tabular}{l c c c c}
\hline
 & Model 1 & Model 2 & Model 3 & Model 4 \\
\hline
treat\_indf & $-0.03$  & $-0.01$  &          &          \\
            & $(0.04)$ & $(0.01)$ &          &          \\
Z           &          &          & $0.03$   & $0.02$   \\
            &          &          & $(0.12)$ & $(0.03)$ \\
\hline
R$^2$       & $0.00$   & $0.00$   & $0.00$   & $0.00$   \\
Adj. R$^2$  & $0.00$   & $0.00$   & $-0.00$  & $-0.00$  \\
Num. obs.   & $623410$ & $623410$ & $3923$   & $3923$   \\
RMSE        & $3.53$   & $0.95$   & $3.47$   & $0.93$   \\
N Clusters  & $350689$ & $350689$ & $2119$   & $2119$   \\
\hline
\multicolumn{5}{l}{\scriptsize{$^{***}p<0.001$; $^{**}p<0.01$; $^{*}p<0.05$}}
\end{tabular}
\caption{Statistical models}
\label{table:coefficients}
\end{center}
\end{table}
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